[EricH]

Originally Posted by Gherkinman

Will do, seriously though. How do you take a screenshot? I press print screen like 5,000,000 times

Try shift and printscreen. At least on my keyboard, that's how it works. (I think)

As for the constrain, try doing a flush constraint with an offset between the end of the pison rod and the end of the cylinder you want it at (then removing that constraint later.)